喷淋脱硫塔喷嘴外流动数值模拟与实验研究

Numerical Simulation and Experimental Study of Flows Outside the Nozzles of a Spray-type Desulfuration Tower

建立了一个喷淋脱硫塔喷嘴数值模型,研究了影响喷淋脱硫塔内气液传质的喷淋液流量与液膜平均破裂长度、喷嘴初始喷射角、液滴平均粒径的关系。设计了专门的测试平台和单匝螺旋喷嘴,采用快速CCD和数码照相机拍照对液膜和液滴运动进行了测试和分析。模型计算和实验结果均表明:液膜平均破裂长度随喷淋液流量加大而减小;液滴平均粒径减小随喷淋液流量加大而减小;在喷嘴出口缝隙高度等于4.25 mm时,随流量的增大,喷嘴的喷射角随流量的增大反而变小,大于4.25 mm后,在同一喷嘴缝隙高度下,喷射角随喷嘴流量的增加而增加。

Established was a numerical simulation model for nozzles of a spray-type desulfuration tower and studied was the relationship among the following items,which can influence the gas-liquid mass transfer inside a spray type desulfuration tower:spray liquid flow rate,average rupture length of the liquid film,initial jet flow angle of the nozzle and average liquid drop diameter.A special test platform and single-turn spiral nozzle were designed and the liquid film and liquiddrop movement were tested and analyzed by using a quick-speed CCD(Charge Coupled Device) with a digital camera being used to take pictures.Both the model calculations and experimental results show that the average liquid film rupture-length and the average liquid drop diameter will decrease with an increase of spray liquid flow rate.When the clearance height at the nozzle outlet is 4.25 mm,the spray angle of the nozzle will decrease with an increase of the liquid flow rate and when the clearance height at the nozzle outlet is greater than 4.25 mm,the spray angle under a same nozzle clearance height will increase with an increase of the liquid flow rate.